Globale .icon-btn Klasse für alle Icon-only Buttons, Hover-Filter, Theme-Anpassungen

wwwroot/js/ui.js

@@ -427,7 +427,7 @@ async function showSystemPromptModal(sessionId) {
   title.textContent = 'System-Prompt';
   const closeBtn = document.createElement('button');
   closeBtn.innerHTML = '<i class="fa fa-times"></i>';
-  closeBtn.className = 'sp-close';
+  closeBtn.className = 'sp-close icon-btn';
   header.appendChild(title);
   header.appendChild(closeBtn);